4l60e problem

[Roy450]

Hello, I have a 2003 silverado 1500 4x4 4.8L with a reman 4l60e that has approx. 11,000 miles on it. The problem i am having started after the trans had 9k on it. After the truck has been driven if it is shut off or idled for a few minutes it will not accelerate or shift normally. The trans is not slipping, the rpms just increase very slowly. It shifts at high rpms and usually very suddenly unles you let off on the gas to shift. This happens through all gears and it will completely go away and shift normally after a few minutes of driving. Also, if has been idling for a few minutes the rpms will go down to abt 450-500 then jump back to abt 650 and the truck will have a shudder as though it is trying to give power to something while just sitting there. It does not make any difference if it is in gear or park. This has never happened taking off with the trans cold and it has no problems with stop and go traffic only after idling or being shut off. It occasionally has a clunk while this is happening. Any suggestions would be greatly appreciated. Thanks

[Swimmer8366]

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